EP3424678B1 - Élement de filtration avec feuilles de support en plastique fluoré nervurées et percées pour un substrat de filtre et son procédé de fabrication - Google Patents

Élement de filtration avec feuilles de support en plastique fluoré nervurées et percées pour un substrat de filtre et son procédé de fabrication Download PDF

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Publication number
EP3424678B1
EP3424678B1 EP18191412.8A EP18191412A EP3424678B1 EP 3424678 B1 EP3424678 B1 EP 3424678B1 EP 18191412 A EP18191412 A EP 18191412A EP 3424678 B1 EP3424678 B1 EP 3424678B1
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EP
European Patent Office
Prior art keywords
sheets
ribs
filter
ribbed
filter member
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EP18191412.8A
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German (de)
English (en)
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EP3424678A1 (fr
Inventor
Andrew G. PLATT
Joel P. TROJNAR
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SWM Luxembourg SARL
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SWM Luxembourg SARL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/02—Perforating by punching, e.g. with relatively-reciprocating punch and bed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/222—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length characterised by the shape of the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0011—Combinations of extrusion moulding with other shaping operations combined with compression moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/35—Extrusion nozzles or dies with rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2265/00—Casings, housings or mounting for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2265/06—Details of supporting structures for filtering material, e.g. cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/10—Multiple layers
    • B01D2275/105—Wound layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene

Definitions

  • This invention relates to a filter member with ribbed and apertured support sheets for a filter substrate extruded from a thermoplastic, fluoroplastic material and to a method of making same.
  • Filter members employing filter media supported on each side by an embossed and apertured support sheet are known in the art. These filter members are commonly employed in cartridge filters for filtering particulate material in a variety of cleaning operations.
  • Filter members for use in cleaning semiconductor components preferably include support sheets made of a fluoroplastic material and most preferably such sheets are apertured to permit filtrate to pass through the sheets into underlying filter media.
  • support sheets made of a fluoroplastic material and most preferably such sheets are apertured to permit filtrate to pass through the sheets into underlying filter media.
  • the fluoroplastic, pleated and apertured sheet disclosed in the Cullen '343 patent is formed by embossing an extruded sheet between a smooth surfaced roll and an opposed roll having projections extending therefrom and completely surrounded by proximal, flat surfaces.
  • This embossing step provided two, interrelated functions. First, it pleated the polymeric sheet film in a specific pattern dictated by the pattern of the projections on the embossing roll opposed to the smooth surface roll. Second it established the location of apertures to be formed in the sheet by a subsequent orientation step. To further explain, the projections on the embossing roll either slit the sheet or provided thin, weakened regions.
  • the embossing operation was responsible both for the embossed, pleated pattern in the sheet and the arrangement of apertures formed therein.
  • the method disclosed in the '343 patent while producing a pleated, apertured web, did not produce the most clearly formed apertures.
  • the pattern of apertures formed in the sheet was dictated by the pattern of raised projections in one of the embossing rolls, which also dictated the pattern of pleats formed in the sheet.
  • the process disclosed in the '343 patent did not provide the desired degree of flexibility of establishing a predetermined pattern of apertures independent of establish a three dimension configuration in the sheet.
  • U.S. Patent No. 8,563,114 assigned to Astenjohnson, Inc, generally discloses an embossed and apertured sheet but is not directed to a high purity, fluoroplastic support sheet employed as part of a filter member.
  • a substrate which can be either paper or a polymer
  • regions between the slits are raised above the plane to form a multitude of bridges or overpasses between the slit regions.
  • the apertures run parallel to the sheet plane; not in the Z-direction through the plane.
  • a Z-direction force imposed by the filtrate on the substrate disclosed in the '114 will tend to flatten out the substrate and close the apertures or slits.
  • the method employed in the ' 114 patent requires the use of a preexisting film and does not suggest the forming of a patterned sheet formed or cast from a molten fluoroplastic material.
  • a filter member of the invention includes a filter substrate and support sheets for said filter substrate which are extruded from a thermoplastic, fluoroplastic material and include a planar, continuous base section having opposed outer surfaces and spaced-apart ribs extending outwardly from said at least one outer surface thereof.
  • the ribs each include an outer distal end and an inner proximal end; said inner proximal end being continuous with an outer surface of said base section.
  • Spaced-apart ribs cooperate with an outer surface from which they extend to provide outer surface segments between adjacent ribs providing continuous flow channels bound by said adjacent spaced-apart ribs for fluid containing material to be filtered.
  • the support sheet includes apertures punched through the entire thickness thereof in a predetermined pattern unaffected by the structure of the support sheet, said predetermined pattern including apertures extending through ribs and outer surface segments between ribs, said ribbed and apertured sheet directing fluid containing material to be filtered along channels and through apertures into said filter substrate.
  • the support sheets for the filter substrate of claim include spaced-apart ribs extending outwardly from both outer surfaces of the continuous base section of the sheets.
  • the plurality of channels between adjacent ribs extends linearly along the support sheet.
  • the support is a cast, unoriented structure.
  • a method of this invention for forming the filter member including said support sheets for a filter structure includes the steps of: (1) extruding a pair of substrates of a thermoplastic, fluoroplastic material through an extrusion die in the form of a continuous sheet and prior to setting said sheet; (2) passing said sheets through a nip region provided by opposed rollers having outer surfaces, said outer surfaces being free of projections extending outwardly therefrom, at least one of said outer surface including counter-sunk grooves therein, said counter-sunk grooves in one of said rollers being aligned with an outer surface or counter-sunk grooves of said other of said rollers in the nip region, whereby said continuous sheets are formed into ribbed sheets, each of said ribbed sheets having a planar, continuous base section and upstanding ribs extending outwardly from at least one outer surface of said base sheet; (3) setting said ribbed sheet; and thereafter, (4) punching apertures through the entire thickness of said ribbed sheet in a predetermined pattern unaffected by the
  • each of the ribbed sheets is a cast sheet that is unoriented in either the machine-direction or cross-machine-direction thereof.
  • a predetermined pattern unaffected by the structure of the support sheet means that the support sheet is not embossed or otherwise provided with slits or weakened regions that are intended to constitute the regions in which apertures are created or formed.
  • the predetermined pattern of apertures in this invention may very well be set, selected or determined by the structure of the ribbed sheet, but the structure of the ribbed sheet is not responsible for providing or establishing the predetermined pattern of apertures.
  • the predetermined pattern of apertures is provided by a predetermined pattern of punch members in a punch press used to create the apertures in the ribbed sheet.
  • the filter media can be either a single layer or a multilayer structure and can be formed from melt blown layers, spun bond layers, other non-woven layers and combinations thereof.
  • filter support members 10 in accordance with this invention support an internal filter substrate 12 to form a composite filter member 14.
  • the filter support members 10 can be of identical constructions; formed from an extruded sheet of a thermoplastic, extrudable fluoroplastic material, most preferably a perfluoroalkoxy (PFA) polymer sold under the designation Noeflon by Daikin.
  • PFA perfluoroalkoxy
  • other fluoroplastics may be usable in this invention, e.g., ethylenechlorotrifluorethylene (ECTFE); ethylenetetrafluoroethylene (ETFE) of polyvinylidene fluoride (PVDF).
  • a fluoroplastic material such as PFA is highly desirable for use in filters intended to clean semiconductor components and in other environments where extreme cleanliness is required and the possibility of contamination is minimized.
  • the support members 10 need to be designed to both direct fluids to be filtered along their surfaces and also for directing the fluids through the structure into the underlying filter substrate 12 to remove undesired particulates from the filtrate.
  • the filter support members depicted in Fig. 1 are designated generically as "10" it should be understood that these members can be of on any of the arrangements/configurations described hereinafter, including but not limited to the arrangements illustrated in Figs. 2A , 2B and 2C , as well as an arrangement of skewed ribs on opposed sides of the continuous base section of the support member.
  • the support members 10 include ribs 22 disposed outwardly from only one side of said member. As illustrated the ribs 22 face outwardly of the composite filter member 14. However, if desired the support members 10 can be reversed to position the spaced-apart ribs in engagement with the internal filter substrate 12. The orientation of the ribs 22 relative to the internal filter substrate 12 is a matter of customer preference.
  • the support member 10 in accordance with one embodiment of this invention is shown in an intermediate stage of formation; after being passed through a nip provided by opposed rolls 30, 32; one roll, e.g., 30 having axially spaced-apart pockets 34 extending circumferentially around its periphery and cooperating with a smooth-surfaced, opposing roll, e.g., 32 ( Fig. 4A ). Thereafter the support member 10 is set to be processed further.
  • the support member 10 is a ribbed substrate including a continuous base section 16 having opposed outer surfaces 18, 20, and spaced-apart ribs 22 extending outwardly from outer surface 20, whereby outer surface segments 24 between adjacent spaced-apart ribs 22 provide continuous fluid directing or flow channels for fluids containing particulates to be filtered therefrom.
  • spaced-apart ribs 22A also can be provided projecting outwardly from outer surface 18 of the base section 16; either in vertical alignment with ribs 22, as illustrated in Fig. 2B , or transversely offset with respect to such ribs 22, as illustrated in Fig. 3C. It should be noted that the arrangement of ribs 22A illustrated in Figs 2B and 2C are formed with the use of the pattern rolls 30A, 32A and 30B, 32B, respectively, and as will be described in greater detail hereinafter.
  • ribs 22 and/or 22A can be formed in a skewed pattern across the sheet as the sheet is passed through the nip of a specially designed set of pattern rolls (not shown).
  • the formation of pockets or grooves in pattern rolls to provide skewed ribs should be easily accomplished by a person skilled in the art; based on the disclosure herein.
  • each of said ribs 22 include an upper distal end 26 and an inner, proximal end 28, and each rib 22 is a continuous extension from base section 16.
  • the ribs 22A have the same arrangement of distal and proximal ends 26A, 28A as the distal and proximal ends 26, 28 of the ribs 22.
  • the ribbed filter support members 10, 10A and 10B, as well as other ribbed support members within the scope of this invention are not pleated structures having projections including underlying recesses complimentary in shape to the projections.
  • the ribbed structures 10, 10A and 10B, as well as other ribbed structures in accordance with this invention all have a continuous, planar base sections.
  • the ribbed filter support members 10, 10A and 10B, as well as other ribbed support members within the scope of this invention do not include any predetermined pattern of weakened regions or slits in the originally formed sheet to affect the location or pattern of apertures that subsequently is formed therein.
  • the substrate is set; preferably without either longitudinal or transverse stretching.
  • This cast substrate can then be wound into a roll and subsequently unwound and directed through a punch press to form apertures 29 through the Z-direction thereof in a desired, predetermined pattern ( Fig. 3A ).
  • the sheet, after being set can be directed in a continuous operation through a punch press to form the predetermined pattern of apertures 29 therein.
  • This predetermined pattern can provide apertures 29 extending both through channel sections, e.g., 24, of the substrate and ribbed sections, e.g., 22 of the substrate, as desired.
  • the filter support members can be stretched in the machine direction, as indicated by the double-headed arrow 40, to elongate the apertures 29 for providing greater open area for passage of the fluid to be filtered by the filter media or substrate 12. This greater open area is evident by comparing Fig. 3B with the non-elongated filter support member shown in Fig. 3A .
  • the three-dimensional configuration of the ribbed substrates of this invention does not affect the actual formation of the apertures 29 therein.
  • the predetermined pattern of apertures 29 is determined by the pattern of punches in a punch press or similar device. This latter pattern may be selected based on the arrangement of ribs 22 and/or 22A in the substrate but there are no weakened regions or slits formed in the ribbed and cast sheet to dictate or predetermine the pattern of apertures formed therein.
  • the substrate for the filter support member 10 shown in Fig. 2A is extruded in a molten state from a conventional extruder into a substantially planar sheet that is passed through the nip of opposed rolls illustrated schematically and in fragmentary view at 30, 32 to form the ribs 22 projecting outwardly from planar base section 16 thereof.
  • the roll 30 is a patterned roll with counter sunk grooves 34 circumferentially continuous about the periphery of the roll and spaced-apart from each other along the axial extent of the roll.
  • grooves or pockets discontinuously about the circumference and/or arranged at an acute angle, e.g., skewed to the rotational axis of the roll.
  • Fig. 4A shows the arrangement of cooperating rolls 30, 32 when ribs, e.g., 22 are only intended to be formed on one side, e.g., side 20 of the planar base 16.
  • the roll 32 opposed to roll 30 has a continuous peripheral surface 34A free of pockets, projections or other three dimensional patterns.
  • FIG. 4B an arrangement of cooperating rolls 30A, 32A is depicted for forming ribs 22 and 22A in alignment with each other and extending from opposed surfaces 20, 18, respectively, of the support member 10A as shown in Fig. 2B .
  • opposed rolls 30A, 32A have circumferential, countersunk grooves 34, 36 in axial alignment with each other to form the ribs 22, 22A, in the support member 10A shown in Fig. 2B .
  • the arrangement of the counter sunk grooves 34 can be selected independently of the arrangement of the counter sunk grooves 36.
  • the grooves 34, 36 can be in alignment with each other about the complete circumference of the rolls 30A, 32A, in which case the raised ribs 22, 22A on opposed surfaces of the substrate will be in alignment with each other, as illustrated in Fig. 2B .
  • the grooves 36 in roll 32B can be out of axial alignment with the grooves 34 in rolls 30B as shown in Fig. 4C to provide ribs 22 that are out of alignment with ribs 22A.
  • the counter-sunk grooves 34, 36 in the roll pairs 30A, 32A ( Fig. 4B ) and 30B, 32B ( Fig. 4C ), can be directly over each other, offset with respect to each other and/or skewed relative to each other, depending on the desired flow paths to be established in one or both surfaces of the support members, e.g., 10, 10A, 10B of this invention.
  • a support member 10 includes 16 - 236 ribs per 10 cm (4 - 60 ribs per inch) on one side; more preferably 40 - 118 ribs per 10 cm (10-30 ribs per inch) and most preferably 79 ribs per 10 cm (20 ribs per inch).
  • the spacing of the ribs may be asymmetrical if so desired.
  • These ribs desirably can be formed in the machine direction of the support members 10, 10A, and 10B.
  • each of the ribs 22, from the distal end 26 thereof to the proximal end 28 contiguous with the outer surface 20 of planar base section 16, is in the range of 0,05 mm - 1,02 mm (2 to 40 mils); more preferably in the range of 0,05 - 0,25 mm (2 to 10 mils) and most preferably about 0,08 mm (3 mils).
  • the depth of the ribs can be varied over the structure, i.e., they may be asymmetrical if so desired.
  • the opposed outer surface 18 can have the same arrangement, spacing and dimensions of ribs as extend from outer surface 20.
  • the important feature in the method of this invention is that there are no sharp projections extending from any of the pattern forming rolls that could provide weakened or slit regions in the extruded substrate or that are intended to pleat the substrate.
  • the filter support members of the filter member of this invention preferably are non-pleated, cast (non-oriented) sheets it is within the broad scope of the invention to subsequently pleat the support members after they have been provided with ribs and apertures therein. Also, as described in connection with Fig. 3B , it is within the scope of the invention to stretch or orient the support members after they have been apertured.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Filtering Materials (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Laminated Bodies (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Filtration Of Liquid (AREA)

Claims (11)

  1. Élément de filtration (14) comprenant un substrat de filtre (12) et des feuilles de support (10) sur des côtés opposés dudit substrat de filtre (12), chacune desdites feuilles de support (10) étant extrudée à partir d'un matériau plastique fluoré thermoplastique, caractérisé en ce que chaque feuille de support (10) comprend une section de base (16) plane et continue ayant des surfaces externes (18, 20) opposées et des nervures (22) espacées s'étendant vers l'extérieur à partir de ladite au moins une surface externe selon un motif prédéterminé souhaité, lesdites nervures (22) comprenant une extrémité distale externe (26) et une extrémité proximale interne (28), ladite extrémité proximale interne étant continue avec une surface externe de ladite section de base (16), lesdites nervures (22) espacées coopérant avec une surface externe à partir de laquelle elles s'étendent pour fournir des segments de surface externe entre des nervures adjacentes fournissant des canaux d'écoulement continus liés par lesdites nervures (22) espacées adjacentes, chacune desdites feuilles de support (10) comprenant en outre des ouvertures (29) percées à travers toute l'épaisseur de celles-ci selon un motif prédéterminé non affecté par le motif prédéterminé des nervures dans chacune des feuilles de support (10), ledit motif prédéterminé d'ouvertures (29) comprenant des ouvertures s'étendant à travers des nervures et des segments de surface externe entre les nervures, lesdites feuilles nervurées et percées dirigeant un fluide contenant un matériau à filtrer le long de canaux et à travers des ouvertures (29) dans ledit substrat de filtre (12).
  2. Élément de filtration selon la revendication 1, dans lequel ledit substrat de filtre (12) est une structure monocouche.
  3. Élément de filtration selon la revendication 1, dans lequel ledit substrat de filtre (12) est une structure multicouche.
  4. Élément de filtration selon la revendication 1, dans lequel ledit substrat de filtre (12) est une structure multicouche, chacune desdites couches de ladite structure multicouche étant une couche non tissée.
  5. Élément de filtration selon la revendication 1, dans lequel ledit substrat de filtre (12) est une structure multicouche, lesdites couches de ladite structure multicouche comprenant une ou plusieurs couches obtenues par fusion-soufflage, des couches obtenues par filage direct, d'autres couches non tissées et des combinaisons de celles-ci.
  6. Élément de filtration selon la revendication 1, dans lequel lesdites feuilles de support (10) sont en outre caractérisées en ce que les nervures (22) espacées s'étendent vers l'extérieur à partir des deux surfaces externes (18, 20) desdites sections de base (16) continues de chacune desdites feuilles de support (10) selon un motif souhaité.
  7. Élément de filtration selon la revendication 1, dans lequel lesdites feuilles de support (10) sont en outre caractérisées en ce que ladite pluralité de canaux entre des nervures adjacentes s'étendent linéairement le long de chacune desdites feuilles de support (10).
  8. Élément de filtration selon la revendication 1, dans lequel lesdites feuilles de support (10) sont en outre caractérisées en ce que lesdites nervures (22) s'étendent en continu le long desdites feuilles (12) sans interruption dans celles-ci.
  9. Élément de filtration selon la revendication 1, caractérisé en ce que chacune desdites feuilles de support (10) est une structure coulée non orientée.
  10. Procédé de formation de l'élément de filtration (14) selon la revendication 1, caractérisé par les étapes suivantes :
    l'extrusion d'une paire de substrats d'un matériau plastique fluoré thermoplastique à travers une filière d'extrusion sous la forme de feuilles continues et avant la mise en place desdites feuilles ;
    le passage desdites feuilles à travers une région de pincement fournie par des rouleaux (30, 32) opposés ayant des surfaces externes, lesdites surfaces externes étant exemptes de saillies s'étendant vers l'extérieur à partir de celles-ci, au moins une desdites surfaces externes comprenant des rainures fraisées (34, 36) à l'intérieur, lesdites rainures fraisées (34, 36) dans l'un desdits rouleaux (30, 32) étant alignées avec une surface externe ou des rainures fraisées (34, 36) dudit autre desdits rouleaux (30, 32) dans la région de pincement, de sorte que lesdites feuilles continues sont formées en feuilles nervurées (10), chacune desdites feuilles nervurées (10) ayant ladite section de base (16) plane et continue et des nervures (22) dressées s'étendant vers l'extérieur à partir d'au moins une surface externe de ladite feuille de base selon un motif souhaité ;
    la mise en place desdites feuilles nervurées ; par la suite,
    le perçage d'ouvertures à travers toute l'épaisseur desdites feuilles nervurées (10) selon un motif prédéterminé non affecté par le motif des nervures (22) dressées ; et
    le positionnement du milieu filtrant entre ladite paire de substrats.
  11. Procédé selon la revendication 10, caractérisé en ce que chacune desdites feuilles nervurées (10) mises en place est une feuille coulée non orientée.
EP18191412.8A 2014-08-06 2015-08-05 Élement de filtration avec feuilles de support en plastique fluoré nervurées et percées pour un substrat de filtre et son procédé de fabrication Active EP3424678B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US201462033683P 2014-08-06 2014-08-06
EP15756505.2A EP3177447B1 (fr) 2014-08-06 2015-08-05 Feuille de support en plastique fluoré à nervures et à ouvertures pour un substrat filtrant et procédé de fabrication associé
PCT/US2015/043766 WO2016022653A1 (fr) 2014-08-06 2015-08-05 Feuille de support en plastique fluoré à nervures et à ouvertures pour un substrat filtrant et procédé de fabrication associé

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP15756505.2A Division EP3177447B1 (fr) 2014-08-06 2015-08-05 Feuille de support en plastique fluoré à nervures et à ouvertures pour un substrat filtrant et procédé de fabrication associé
EP15756505.2A Division-Into EP3177447B1 (fr) 2014-08-06 2015-08-05 Feuille de support en plastique fluoré à nervures et à ouvertures pour un substrat filtrant et procédé de fabrication associé

Publications (2)

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EP3424678A1 EP3424678A1 (fr) 2019-01-09
EP3424678B1 true EP3424678B1 (fr) 2022-06-22

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EP18191412.8A Active EP3424678B1 (fr) 2014-08-06 2015-08-05 Élement de filtration avec feuilles de support en plastique fluoré nervurées et percées pour un substrat de filtre et son procédé de fabrication
EP15756505.2A Active EP3177447B1 (fr) 2014-08-06 2015-08-05 Feuille de support en plastique fluoré à nervures et à ouvertures pour un substrat filtrant et procédé de fabrication associé

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US (1) US11179864B2 (fr)
EP (2) EP3424678B1 (fr)
JP (1) JP6636520B2 (fr)
KR (1) KR102313525B1 (fr)
CN (1) CN106794590B (fr)
CA (1) CA2957072C (fr)
ES (2) ES2924555T3 (fr)
WO (1) WO2016022653A1 (fr)

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US11724233B2 (en) * 2020-02-07 2023-08-15 Seagate Technology Llc High-flux efficiency filter fabrication using a flip bond process with supportive structure

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Also Published As

Publication number Publication date
CA2957072C (fr) 2022-05-31
US20170225378A1 (en) 2017-08-10
KR20170037666A (ko) 2017-04-04
ES2924555T3 (es) 2022-10-07
JP6636520B2 (ja) 2020-01-29
EP3177447A1 (fr) 2017-06-14
ES2704246T3 (es) 2019-03-15
EP3177447B1 (fr) 2018-10-03
EP3424678A1 (fr) 2019-01-09
US11179864B2 (en) 2021-11-23
KR102313525B1 (ko) 2021-10-15
JP2017532230A (ja) 2017-11-02
CA2957072A1 (fr) 2016-02-11
CN106794590A (zh) 2017-05-31
WO2016022653A1 (fr) 2016-02-11
CN106794590B (zh) 2019-05-28

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